Audio player shows and disappear in Firefox

I try to use HTML5's audio tag to play a music file on my site. This is my syntax: &lt;audio controls="controls"&gt; &lt;source type="audio/ogg" src="/portals/0/BelizeNationalAnthem.ogg"&gt;&lt;/source&gt;<br/> &lt;source type="audio/mp3" src="/portals/0/BelizeNationalAnthem.mp3"&gt;&lt;/source&gt;<br/> &lt;/audio&gt; The problem I am encountering is that when I refresh my page, I can see the player, but only for a few seconds, then it fade out. I have tried using my Firefox to visit some other sites that use the same HTML5 audio tag, and it works fine. I try to visit my page in Chrome and IE normally. So I don't understand what is causing my Firefox to fade out the music player.